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a. & n. from Screw, v. t. Screwing machine. See Screw machine, under Screw.

may be verified, or on which they may be checked. -- Check nut (Mech.), a secondary nut, screwing down upon the primary nut to secure it. Knight. -- Check valve (Mech.), a valve in the feed pipe of a boiler to prevent the return of the feed water. -- To take check, to take offense. [Obs.] Dryden.

scape-wheel has two sets of teeth. See Escapement. -- Duplex lathe, one for turning off, screwing, and surfacing, by means of two cutting tools, on opposite sides of the piece operated upon. -- Duplex pumping engine, a steam pump in which two steam cylinders are placed side by side, one operating the valves of the ot…

ew, an iron bolt with a square head, a sharp-edged thread, and a sharp point, adapted for screwing into wood; a screw for fastening lags.

r Infernal. -- Machine gun.See under Gun. -- Machine screw, a screw or bolt adapted for screwing into metal, in distinction from one which is designed especially to be screwed into wood. -- Machine shop, a workshop where machines are made, or where metal is shaped by cutting, filing, turning, etc. -- Machine tool,…

p tightly against another nut on the same bolt or screw, in order to prevent accidental unscrewing of the first nut. -- Nut buoy. See under Buoy. -- Nut coal, screened coal of a size smaller than stove coal and larger than pea coal; -- called also chestnut coal. -- Nut crab (Zoöl.), any leucosoid crab of the genus E…

ppress by unreasonable or extortionate exactions. Our country landlords, by unmeasureable screwing and racking their tenants, have already reduced the miserable people to a worse condition than the peasants in France. swift.

ad of a bolt, and used as a lever to turn it with; a wrench; specifically, a wrench for unscrewing or tightening the couplings of hose.